PC Stats posted a review on the ASUS P7P55D-E Pro Intel P55 Express Motherboard
A quote from the article:
>> ASUS P7P55D-E Pro Intel P55 Express Motherboard Review
There's more to ASUS' P7P55D-E Pro motherboard than just high bandwidth connections.
Gamers will be pleased to hear that the P7P55D-E Pro supports dual videocard SLI/Crossfire gaming configurations in a x8/x8 PCI Express 2.0
arrangement, or a single videocard in x16 mode. ATI and NVIDIA both have competing multi GPU videocards, so the P7P55D-E Pro's support for quad GPU gaming means this motherboard can be turned into a real graphics powerhouse.
>> ASUS P7P55D-E Pro Intel P55 Express Motherboard Review